"Undone – The Sweater Song" is a song by the American alternative rock band Weezer, released on the band's self-titled 1994 debut album. It was released as their debut single in 1994. Weezer frontman Rivers Cuomo has commented on the song, saying: "Undone" is the feeling you get when the train stops and the little guy comes knockin' on your door. It was supposed to be a sad song, but everyone thinks it's hilarious.